util_reauth.c

   1 /*
   2  * Copyright (c) 2010, JANET(UK)
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  *
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  *
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * 3. Neither the name of JANET(UK) nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  21  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  */
  32
  33 #include "gssapiP_eap.h"
  34
  35 #include <dlfcn.h>
  36
  37 /*
  38  * Fast reauthentication support for EAP GSS.
  39  */
  40
  41 krb5_error_code
  42 krb5_encrypt_tkt_part(krb5_context, const krb5_keyblock *, krb5_ticket *);
  43
  44 krb5_error_code
  45 encode_krb5_ticket(const krb5_ticket *rep, krb5_data **code);
  46
  47 static krb5_error_code
  48 getAcceptorKey(krb5_context krbContext,
  49                gss_ctx_id_t ctx,
  50                gss_cred_id_t cred,
  51                krb5_principal *princ,
  52                krb5_keyblock *key)
  53 {
  54     krb5_error_code code;
  55     krb5_keytab keytab = NULL;
  56     krb5_keytab_entry ktent;
  57     krb5_kt_cursor cursor = NULL;
  58
  59     *princ = NULL;
  60     memset(key, 0, sizeof(*key));
  61     memset(&ktent, 0, sizeof(ktent));
  62
  63     code = krb5_kt_default(krbContext, &keytab);
  64     if (code != 0)
  65         goto cleanup;
  66
  67     if (cred != GSS_C_NO_CREDENTIAL && cred->name != GSS_C_NO_NAME) {
  68         code = krb5_kt_get_entry(krbContext, keytab,
  69                                  cred->name->krbPrincipal, 0,
  70                                  ctx->encryptionType, &ktent);
  71         if (code != 0)
  72             goto cleanup;
  73     } else {
  74         code = krb5_kt_start_seq_get(krbContext, keytab, &cursor);
  75         if (code != 0)
  76             goto cleanup;
  77
  78         while ((code = krb5_kt_next_entry(krbContext, keytab,
  79                                           &ktent, &cursor)) == 0) {
  80             if (ktent.key.enctype == ctx->encryptionType) {
  81                 break;
  82             } else {
  83                 krb5_free_keytab_entry_contents(krbContext, &ktent);
  84             }
  85         }
  86     }
  87
  88     if (code == 0) {
  89         *princ = ktent.principal;
  90         *key = ktent.key;
  91     }
  92
  93 cleanup:
  94     if (cred == GSS_C_NO_CREDENTIAL || cred->name == GSS_C_NO_NAME)
  95         krb5_kt_end_seq_get(krbContext, keytab, &cursor);
  96     krb5_kt_close(krbContext, keytab);
  97
  98     if (code != 0) {
  99         if (*princ != NULL) {
 100             krb5_free_principal(krbContext, *princ);
 101             *princ = NULL;
 102         }
 103         krb5_free_keyblock_contents(krbContext, key),
 104         memset(key, 0, sizeof(key));
 105     }
 106
 107     return code;
 108 }
 109
 110 OM_uint32
 111 gssEapMakeReauthCreds(OM_uint32 *minor,
 112                       gss_ctx_id_t ctx,
 113                       gss_cred_id_t cred,
 114                       gss_buffer_t credBuf)
 115 {
 116     OM_uint32 major = GSS_S_COMPLETE;
 117     krb5_error_code code;
 118     krb5_context krbContext = NULL;
 119     krb5_ticket ticket = { 0 };
 120     krb5_keyblock session = { 0 }, acceptorKey = { 0 };
 121     krb5_enc_tkt_part enc_part = { 0 };
 122     gss_buffer_desc attrBuf = GSS_C_EMPTY_BUFFER;
 123     krb5_authdata *authData[2], authDatum = { 0 };
 124     krb5_data *ticketData = NULL, *credsData = NULL;
 125     krb5_creds creds = { 0 };
 126     krb5_auth_context authContext = NULL;
 127
 128     credBuf->length = 0;
 129     credBuf->value = NULL;
 130
 131     GSSEAP_KRB_INIT(&krbContext);
 132
 133     code = getAcceptorKey(krbContext, ctx, cred,
 134                           &ticket.server, &acceptorKey);
 135     if (code == KRB5_KT_NOTFOUND) {
 136         gss_buffer_desc emptyToken = { 0, "" };
 137
 138         /*
 139          * If we can't produce the KRB-CRED message, we need to
 140          * return an empty (not NULL) token to the caller so we
 141          * don't change the number of authentication legs.
 142          */
 143         return duplicateBuffer(minor, &emptyToken, credBuf);
 144     } else if (code != 0)
 145         goto cleanup;
 146
 147     enc_part.flags = TKT_FLG_INITIAL;
 148
 149     code = krb5_c_make_random_key(krbContext, ctx->encryptionType,
 150                                   &session);
 151     if (code != 0)
 152         goto cleanup;
 153
 154     enc_part.session = &session;
 155     enc_part.client = ctx->initiatorName->krbPrincipal;
 156     enc_part.times.authtime = time(NULL);
 157     enc_part.times.starttime = enc_part.times.authtime;
 158     enc_part.times.endtime = ctx->expiryTime
 159                              ? ctx->expiryTime
 160                              : KRB5_INT32_MAX;
 161     enc_part.times.renew_till = 0;
 162
 163     major = gssEapExportAttrContext(minor, ctx->initiatorName,
 164                                     &attrBuf);
 165     if (GSS_ERROR(major))
 166         goto cleanup;
 167
 168     authDatum.ad_type = KRB5_AUTHDATA_RADIUS_AVP;
 169     authDatum.length = attrBuf.length;
 170     authDatum.contents = attrBuf.value;
 171     authData[0] = &authDatum;
 172     authData[1] = NULL;
 173     enc_part.authorization_data = authData;
 174
 175     ticket.enc_part2 = &enc_part;
 176
 177     code = krb5_encrypt_tkt_part(krbContext, &acceptorKey, &ticket);
 178     if (code != 0)
 179         goto cleanup;
 180
 181     code = encode_krb5_ticket(&ticket, &ticketData);
 182     if (code != 0)
 183         goto cleanup;
 184
 185     creds.client = enc_part.client;
 186     creds.server = ticket.server;
 187     creds.keyblock = session;
 188     creds.times = enc_part.times;
 189     creds.ticket_flags = enc_part.flags;
 190     creds.ticket = *ticketData;
 191     creds.authdata = authData;
 192
 193     code = krb5_auth_con_init(krbContext, &authContext);
 194     if (code != 0)
 195         goto cleanup;
 196
 197     code = krb5_auth_con_setflags(krbContext, authContext, 0);
 198     if (code != 0)
 199         goto cleanup;
 200
 201     code = krb5_auth_con_setsendsubkey(krbContext, authContext,
 202                                        &ctx->rfc3961Key);
 203     if (code != 0)
 204         goto cleanup;
 205
 206     code = krb5_mk_1cred(krbContext, authContext, &creds, &credsData, NULL);
 207     if (code != 0)
 208         goto cleanup;
 209
 210     krbDataToGssBuffer(credsData, credBuf);
 211
 212 cleanup:
 213     if (ticket.enc_part.ciphertext.data != NULL)
 214         GSSEAP_FREE(ticket.enc_part.ciphertext.data);
 215     krb5_free_keyblock_contents(krbContext, &session);
 216     krb5_free_keyblock_contents(krbContext, &acceptorKey);
 217     gss_release_buffer(minor, &attrBuf);
 218     krb5_free_data(krbContext, ticketData);
 219     krb5_auth_con_free(krbContext, authContext);
 220     if (credsData != NULL)
 221         GSSEAP_FREE(credsData);
 222
 223     if (major == GSS_S_COMPLETE) {
 224         *minor = code;
 225         major = code != 0 ? GSS_S_FAILURE : GSS_S_COMPLETE;
 226     }
 227
 228     return major;
 229 }
 230
 231 static int
 232 isTicketGrantingServiceP(krb5_context krbContext,
 233                          krb5_const_principal principal)
 234 {
 235     if (krb5_princ_size(krbContext, principal) == 2 &&
 236         krb5_princ_component(krbContext, principal, 0)->length == 6 &&
 237         memcmp(krb5_princ_component(krbContext, principal, 0)->data, "krbtgt", 6) == 0)
 238         return TRUE;
 239
 240     return FALSE;
 241 }
 242
 243 OM_uint32
 244 gssEapStoreReauthCreds(OM_uint32 *minor,
 245                        gss_ctx_id_t ctx,
 246                        gss_cred_id_t cred,
 247                        gss_buffer_t credBuf)
 248 {
 249     OM_uint32 major = GSS_S_COMPLETE, code;
 250     krb5_context krbContext = NULL;
 251     krb5_auth_context authContext = NULL;
 252     krb5_data credData = { 0 };
 253     krb5_creds **creds = NULL;
 254     krb5_principal canonPrinc;
 255     int i;
 256
 257     if (credBuf->length == 0 || cred == GSS_C_NO_CREDENTIAL)
 258         return GSS_S_COMPLETE;
 259
 260     GSSEAP_KRB_INIT(&krbContext);
 261
 262     code = krb5_auth_con_init(krbContext, &authContext);
 263     if (code != 0)
 264         goto cleanup;
 265
 266     code = krb5_auth_con_setflags(krbContext, authContext, 0);
 267     if (code != 0)
 268         goto cleanup;
 269
 270     code = krb5_auth_con_setrecvsubkey(krbContext, authContext,
 271                                        &ctx->rfc3961Key);
 272     if (code != 0)
 273         goto cleanup;
 274
 275     gssBufferToKrbData(credBuf, &credData);
 276
 277     code = krb5_rd_cred(krbContext, authContext, &credData, &creds, NULL);
 278     if (code != 0)
 279         goto cleanup;
 280
 281     if (creds == NULL || creds[0] == NULL)
 282         goto cleanup;
 283
 284     code = krb5_copy_principal(krbContext, creds[0]->client, &canonPrinc);
 285     if (code != 0)
 286         goto cleanup;
 287
 288     krb5_free_principal(krbContext, cred->name->krbPrincipal);
 289     cred->name->krbPrincipal = canonPrinc;
 290
 291     cred->expiryTime = creds[0]->times.endtime;
 292
 293     code = krb5_cc_new_unique(krbContext, "MEMORY", NULL, &cred->krbCredCache);
 294     if (code != 0)
 295         goto cleanup;
 296
 297     code = krb5_cc_initialize(krbContext, cred->krbCredCache,
 298                               creds[0]->client);
 299     if (code != 0)
 300         goto cleanup;
 301
 302     for (i = 0; creds[i] != NULL; i++) {
 303         krb5_creds kcred = *(creds[i]);
 304
 305         /*
 306          * Swap in the acceptor name the client asked for so
 307          * get_credentials() works
 308          */
 309         if (!isTicketGrantingServiceP(krbContext, kcred.server))
 310             kcred.server = ctx->acceptorName->krbPrincipal;
 311
 312         code = krb5_cc_store_cred(krbContext, cred->krbCredCache, &kcred);
 313         if (code != 0)
 314             goto cleanup;
 315     }
 316
 317     major = gss_krb5_import_cred(minor, cred->krbCredCache, NULL, NULL,
 318                                  &cred->krbCred);
 319     if (GSS_ERROR(major))
 320         goto cleanup;
 321
 322 cleanup:
 323     *minor = code;
 324
 325     krb5_auth_con_free(krbContext, authContext);
 326     if (creds != NULL) {
 327         for (i = 0; creds[i] != NULL; i++)
 328             krb5_free_creds(krbContext, creds[i]);
 329     }
 330     if (major == GSS_S_COMPLETE)
 331         major = *minor ? GSS_S_FAILURE : GSS_S_COMPLETE;
 332
 333     return major;
 334 }
 335
 336 static OM_uint32 (*gssInitSecContextNext)(
 337     OM_uint32 *minor,
 338     gss_cred_id_t cred,
 339     gss_ctx_id_t *context_handle,
 340     gss_name_t target_name,
 341     gss_OID mech_type,
 342     OM_uint32 req_flags,
 343     OM_uint32 time_req,
 344     gss_channel_bindings_t input_chan_bindings,
 345     gss_buffer_t input_token,
 346     gss_OID *actual_mech_type,
 347     gss_buffer_t output_token,
 348     OM_uint32 *ret_flags,
 349     OM_uint32 *time_rec);
 350
 351 static OM_uint32 (*gssAcceptSecContextNext)(
 352     OM_uint32 *minor,
 353     gss_ctx_id_t *context_handle,
 354     gss_cred_id_t cred,
 355     gss_buffer_t input_token,
 356     gss_channel_bindings_t input_chan_bindings,
 357     gss_name_t *src_name,
 358     gss_OID *mech_type,
 359     gss_buffer_t output_token,
 360     OM_uint32 *ret_flags,
 361     OM_uint32 *time_rec,
 362     gss_cred_id_t *delegated_cred_handle);
 363
 364 static OM_uint32 (*gssReleaseCredNext)(
 365     OM_uint32 *minor,
 366     gss_cred_id_t *cred_handle);
 367
 368 static OM_uint32 (*gssReleaseNameNext)(
 369     OM_uint32 *minor,
 370     gss_name_t *name);
 371
 372 static OM_uint32 (*gssInquireSecContextByOidNext)(
 373     OM_uint32 *minor,
 374     const gss_ctx_id_t context_handle,
 375     const gss_OID desired_object,
 376     gss_buffer_set_t *data_set);
 377
 378 static OM_uint32 (*gssDeleteSecContextNext)(
 379     OM_uint32 *minor,
 380     gss_ctx_id_t *context_handle,
 381     gss_buffer_t output_token);
 382
 383 static OM_uint32 (*gssDisplayNameNext)(
 384     OM_uint32 *minor,
 385     gss_name_t name,
 386     gss_buffer_t output_name_buffer,
 387     gss_OID *output_name_type);
 388
 389 static OM_uint32 (*gssImportNameNext)(
 390     OM_uint32 *minor,
 391     gss_buffer_t buffer,
 392     gss_OID nameType,
 393     gss_name_t *outputName);
 394
 395 static OM_uint32 (*gssKrbExtractAuthzDataFromSecContextNext)(
 396     OM_uint32 *minor,
 397     const gss_ctx_id_t context_handle,
 398     int ad_type,
 399     gss_buffer_t ad_data);
 400
 401 #define NEXT_SYMBOL(local, global)  ((local) = dlsym(RTLD_NEXT, (global)))
 402
 403 OM_uint32
 404 gssEapReauthInitialize(OM_uint32 *minor)
 405 {
 406     NEXT_SYMBOL(gssInitSecContextNext,                    "gss_init_sec_context");
 407     NEXT_SYMBOL(gssAcceptSecContextNext,                  "gss_accept_sec_context");
 408     NEXT_SYMBOL(gssReleaseCredNext,                       "gss_release_cred");
 409     NEXT_SYMBOL(gssReleaseNameNext,                       "gss_release_name");
 410     NEXT_SYMBOL(gssInquireSecContextByOidNext,            "gss_inquire_sec_context_by_oid");
 411     NEXT_SYMBOL(gssDeleteSecContextNext,                  "gss_delete_sec_context");
 412     NEXT_SYMBOL(gssDisplayNameNext,                       "gss_display_name");
 413     NEXT_SYMBOL(gssImportNameNext,                        "gss_import_name");
 414     NEXT_SYMBOL(gssKrbExtractAuthzDataFromSecContextNext, "gsskrb5_extract_authz_data_from_sec_context");
 415
 416     return GSS_S_COMPLETE;
 417 }
 418
 419 OM_uint32
 420 gssInitSecContext(OM_uint32 *minor,
 421                   gss_cred_id_t cred,
 422                   gss_ctx_id_t *context_handle,
 423                   gss_name_t target_name,
 424                   gss_OID mech_type,
 425                   OM_uint32 req_flags,
 426                   OM_uint32 time_req,
 427                   gss_channel_bindings_t input_chan_bindings,
 428                   gss_buffer_t input_token,
 429                   gss_OID *actual_mech_type,
 430                   gss_buffer_t output_token,
 431                   OM_uint32 *ret_flags,
 432                   OM_uint32 *time_rec)
 433 {
 434     if (gssInitSecContextNext == NULL)
 435         return GSS_S_UNAVAILABLE;
 436
 437     return gssInitSecContextNext(minor, cred, context_handle,
 438                                  target_name, mech_type, req_flags,
 439                                  time_req, input_chan_bindings,
 440                                  input_token, actual_mech_type,
 441                                  output_token, ret_flags, time_rec);
 442 }
 443
 444 OM_uint32
 445 gssAcceptSecContext(OM_uint32 *minor,
 446                     gss_ctx_id_t *context_handle,
 447                     gss_cred_id_t cred,
 448                     gss_buffer_t input_token,
 449                     gss_channel_bindings_t input_chan_bindings,
 450                     gss_name_t *src_name,
 451                     gss_OID *mech_type,
 452                     gss_buffer_t output_token,
 453                     OM_uint32 *ret_flags,
 454                     OM_uint32 *time_rec,
 455                     gss_cred_id_t *delegated_cred_handle)
 456 {
 457     if (gssAcceptSecContextNext == NULL)
 458         return GSS_S_UNAVAILABLE;
 459
 460     return gssAcceptSecContextNext(minor, context_handle, cred,
 461                                    input_token, input_chan_bindings,
 462                                    src_name, mech_type, output_token,
 463                                    ret_flags, time_rec, delegated_cred_handle);
 464 }
 465
 466 OM_uint32
 467 gssReleaseCred(OM_uint32 *minor,
 468                gss_cred_id_t *cred_handle)
 469 {
 470     if (gssReleaseCredNext == NULL)
 471         return GSS_S_UNAVAILABLE;
 472
 473     return gssReleaseCredNext(minor, cred_handle);
 474 }
 475
 476 OM_uint32
 477 gssReleaseName(OM_uint32 *minor,
 478                gss_name_t *name)
 479 {
 480     if (gssReleaseName == NULL)
 481         return GSS_S_UNAVAILABLE;
 482
 483     return gssReleaseNameNext(minor, name);
 484 }
 485
 486 OM_uint32
 487 gssDeleteSecContext(OM_uint32 *minor,
 488                     gss_ctx_id_t *context_handle,
 489                     gss_buffer_t output_token)
 490 {
 491     if (gssDeleteSecContextNext == NULL)
 492         return GSS_S_UNAVAILABLE;
 493
 494     return gssDeleteSecContextNext(minor, context_handle, output_token);
 495 }
 496
 497 static OM_uint32
 498 gssDisplayName(OM_uint32 *minor,
 499                gss_name_t name,
 500                gss_buffer_t buffer,
 501                gss_OID *name_type)
 502 {
 503     if (gssDisplayNameNext == NULL)
 504         return GSS_S_UNAVAILABLE;
 505
 506     return gssDisplayNameNext(minor, name, buffer, name_type);
 507 }
 508
 509 static OM_uint32
 510 gssImportName(OM_uint32 *minor,
 511               gss_buffer_t buffer,
 512               gss_OID name_type,
 513               gss_name_t *name)
 514 {
 515     if (gssImportNameNext == NULL)
 516         return GSS_S_UNAVAILABLE;
 517
 518     return gssImportNameNext(minor, buffer, name_type, name);
 519 }
 520
 521 OM_uint32
 522 gssInquireSecContextByOid(OM_uint32 *minor,
 523                           const gss_ctx_id_t context_handle,
 524                           const gss_OID desired_object,
 525                           gss_buffer_set_t *data_set)
 526 {
 527     if (gssInquireSecContextByOidNext == NULL)
 528         return GSS_S_UNAVAILABLE;
 529
 530     return gssInquireSecContextByOidNext(minor, context_handle,
 531                                          desired_object, data_set);
 532 }
 533
 534 OM_uint32
 535 gssKrbExtractAuthzDataFromSecContext(OM_uint32 *minor,
 536                                      const gss_ctx_id_t ctx,
 537                                      int ad_type,
 538                                      gss_buffer_t ad_data)
 539 {
 540     if (gssKrbExtractAuthzDataFromSecContextNext == NULL)
 541         return GSS_S_UNAVAILABLE;
 542
 543     return gssKrbExtractAuthzDataFromSecContextNext(minor, ctx,
 544                                                     ad_type, ad_data);
 545 }
 546
 547 OM_uint32
 548 gssEapGlueToMechName(OM_uint32 *minor,
 549                      gss_name_t glueName,
 550                      gss_name_t *pMechName)
 551 {
 552     OM_uint32 major, tmpMinor;
 553     gss_buffer_desc nameBuf = GSS_C_EMPTY_BUFFER;
 554
 555     *pMechName = GSS_C_NO_NAME;
 556
 557     major = gssDisplayName(minor, glueName, &nameBuf, NULL);
 558     if (GSS_ERROR(major))
 559         goto cleanup;
 560
 561     major = gssEapImportName(minor, &nameBuf, GSS_C_NT_USER_NAME,
 562                              pMechName);
 563     if (GSS_ERROR(major))
 564         goto cleanup;
 565
 566 cleanup:
 567     gss_release_buffer(&tmpMinor, &nameBuf);
 568
 569     return major;
 570 }
 571
 572 OM_uint32
 573 gssEapMechToGlueName(OM_uint32 *minor,
 574                      gss_name_t mechName,
 575                      gss_name_t *pGlueName)
 576 {
 577     OM_uint32 major, tmpMinor;
 578     gss_buffer_desc nameBuf = GSS_C_EMPTY_BUFFER;
 579
 580     *pGlueName = GSS_C_NO_NAME;
 581
 582     major = gssEapDisplayName(minor, mechName, &nameBuf, NULL);
 583     if (GSS_ERROR(major))
 584         goto cleanup;
 585
 586     major = gssImportName(minor, &nameBuf, GSS_C_NT_USER_NAME,
 587                           pGlueName);
 588     if (GSS_ERROR(major))
 589         goto cleanup;
 590
 591 cleanup:
 592     gss_release_buffer(&tmpMinor, &nameBuf);
 593
 594     return major;
 595 }
 596
 597 OM_uint32
 598 gssEapReauthComplete(OM_uint32 *minor,
 599                     gss_ctx_id_t ctx,
 600                     gss_cred_id_t cred,
 601                     const gss_OID mech,
 602                     OM_uint32 timeRec)
 603 {
 604     OM_uint32 major, tmpMinor;
 605     gss_buffer_set_t keyData = GSS_C_NO_BUFFER_SET;
 606
 607     if (!oidEqual(mech, gss_mech_krb5)) {
 608         major = GSS_S_BAD_MECH;
 609         goto cleanup;
 610     }
 611
 612     major = gssInquireSecContextByOid(minor, ctx->kerberosCtx,
 613                                       GSS_C_INQ_SSPI_SESSION_KEY, &keyData);
 614     if (GSS_ERROR(major))
 615         goto cleanup;
 616
 617     {
 618         gss_OID_desc oid;
 619         int suffix;
 620
 621         oid.length = keyData->elements[1].length;
 622         oid.elements = keyData->elements[1].value;
 623
 624         /* GSS_KRB5_SESSION_KEY_ENCTYPE_OID */
 625         major = decomposeOid(minor,
 626                              "\x2a\x86\x48\x86\xf7\x12\x01\x02\x02\x04",
 627                              10, &oid, &suffix);
 628         if (GSS_ERROR(major))
 629             goto cleanup;
 630
 631         ctx->encryptionType = suffix;
 632     }
 633
 634     {
 635         krb5_context krbContext = NULL;
 636         krb5_keyblock key;
 637
 638         GSSEAP_KRB_INIT(&krbContext);
 639
 640         KRB_KEY_LENGTH(&key) = keyData->elements[0].length;
 641         KRB_KEY_DATA(&key)   = keyData->elements[0].value;
 642         KRB_KEY_TYPE(&key)   = ctx->encryptionType;
 643
 644         *minor = krb5_copy_keyblock_contents(krbContext,
 645                                              &key, &ctx->rfc3961Key);
 646         if (*minor != 0) {
 647             major = GSS_S_FAILURE;
 648             goto cleanup;
 649         }
 650     }
 651
 652     major = rfc3961ChecksumTypeForKey(minor, &ctx->rfc3961Key,
 653                                       &ctx->checksumType);
 654     if (GSS_ERROR(major))
 655         goto cleanup;
 656
 657     if (timeRec != GSS_C_INDEFINITE)
 658         ctx->expiryTime = time(NULL) + timeRec;
 659
 660     major = sequenceInit(minor,
 661                          &ctx->seqState, ctx->recvSeq,
 662                          ((ctx->gssFlags & GSS_C_REPLAY_FLAG) != 0),
 663                          ((ctx->gssFlags & GSS_C_SEQUENCE_FLAG) != 0),
 664                          TRUE);
 665     if (GSS_ERROR(major))
 666         goto cleanup;
 667
 668     major = GSS_S_COMPLETE;
 669
 670 cleanup:
 671     gss_release_buffer_set(&tmpMinor, &keyData);
 672
 673     return major;
 674 }